Artificial tooth



April 1, 1930.

s. MYERSON I ARTIFICIAL TEETH Filed April 13. 1928 499 1a /2 a A? Patented Apr. 1, 1930 PATENT OFFICE SIMON MYERSON, OF CAMBRIDGE, MASSACHUSETTS ARTIFICIAL TOOTH Application filed April 13,

This invention is an improvement on the artificial teeth disclosed by my application filed March 16, 1928, Serial Number 262,193, said tooth being adapted tobe secured to a bridge or in a denture, and including a molded body of porcelain and a metal plate engageable by solder with a bridge, or with another portion or portions of a denture, an obj ectbeingtoprovide atooth body of suitable strength, adapted to be engaged with a metal holding plate between its occlusal and gingival surfaces, so that the body has the advan tage of porcelain contact with gum tissues, and of aporcelain occlusal surface for articulation, and is replaceable on the holding plate in case of breakage, the holding plate being adapted to be firmly engaged with and support the body and conveniently soldered to a holding part or parts.

The chief object of the present invention is to improve the form of the tooth body and the holding plate, so that an exposed solderengaging portion of any holding plate may be soldered securely to an adjacent plate, whether one plate be higher or lower than the other, or on the same level therewith, and this without rendering any other exposed portion of the plate objectionably conspicuous.

Of the accompanying drawings forming a part of this specification,

Figure 1 is a perspective view of a tooth body slotted and recessed in accordance with my invention.

Figure 2 is a perspective view of the hold ing plate used with the body shown by Figure 1.

Figure 3 is a perspective view of the tooth with the holding plate in place.

Figure 4 is a side View of a differently formed tooth body and differently slotted and recessed.

Figure 5 is a perspective view of the holding plate used with the tooth shown by F igure 4.

Figure 6 is a side view, showing the body of Figure 4, and the plate of Figure 5, assembled.

Figure 7 is a section on line 77 of Figure 6.

1928. Serial No. 269,696.

Figure 8 is a section on line 88 of Figure 6. 7

Figures 9 and 10 are side views of tooth bodies formed similarly to that shown by Figures 4 to 8, and differently slotted and recessed.

The same reference characters indicate the same parts in all of the figures.

A tooth body 12 embodying the invention, may be variously formed and may be a back tooth having an occlusal portion 14, and a gingival portion 15, as shown by Figures 1 and 3, or a front tooth having a gingival por tion 16, and an incisal portion 17, as shown by Figures 4, 6, 7, 8 and 10.

In the body 12 is formed a slot 18, opening on and wholly interrupting one of the faces and extending therefrom partly to the opposite face from which the closed inner end of the slot is spaced so that said opposite face is entirely uninterrupted or continuous. The slot opens on and partly interrupts two intermediate faces of the tooth, and said intermediate faces are provided with recesses 19, which are wider and preferably longer tha-nthe slot, the bottoms of the re cesses preferably extending above and below the slot, and from the closed end thereof.

20 designates a, metal plate, formed to fit the slot 18. The plate, which may be of gold, or any other suitable metal, is provided with two flanged relatively wide opposite edge portions 21, fitting the recesses 19, and substantially flush with the said intermediate faces, and a narrower exposed edgeportion 22, fitting the mouth portion of the slot in the wholly interrupted face of the body 12, and substantially flush with said face.

Figures 1 and 3 show the slot 18, arranged to wholly interrupt the lingual face of the body 12, and inclined toward the occlusaland buccal faces of the body.

Figures 4, 6 and 7 show the slot arranged to wholly interrupt the gingival face and extending lengthwise of the body, between the lingual and labial faces, the closed end of the slot being spaced from the incisal face or edge 17.

Figure 9 shows the slot inclined from the labial face toward the gingival and lingual faces.

Figure shows the slot inclined from the lfingual face toward the labial and gingival aces.

The holding plate engaged with either of the bodies, shown by Figures 9 and 10 will be formed substantially as shown by Figures 5, 6, 7 and 8, the form being suitably modified 1 to conform to the inclination of the slot and recesses.

The advantages of the described improvement characterized by the lateral recesses 19, and the plate having the wider flanged edge portions 21, and the narrower edge portion 22, are, first, that the edge portions 21 have a relatively large area, so that when the teeth are assembled in predetermined relative positions, sufficient contact between SOl(lGl-CO11- go nected surfaces is ensured, should one edge portion 21 be higher or lower, or otherwise somewhat out of accurate registration with a mating edge portion; and secondly, that the exposed edge portion 22 is so narrow that it u is not objectionably conspicuous, and a lesser area of metal is exposed to the action of the fluids of the month.

When the tooth is formed as shown by Figures 4 and 8, there is the advantage that so the edge 22 on the gingival face, has only a.

limited contact with the gum.

In each of the illustrated embodiments of the invention, the tooth body contains a narrow slot 18, having a narrow mouth open- :5 ing on and wholly interrupting one body face and a narrow closed inner end spaced from the opposite body face a distance much greater than the width of the slot, or the distance between the opposite sides thereof, so that the 0 slot is adapted to receive a metal plate 20, which presents a narrow exposed edge at the mouth of the slot and is of sufiicient area to tie together the relatively wide flanged edge portions 21 of the plate and confine said portions 4.! in recesses 19 in lateral body faces. The

plate constitutes a web so nearly coextensive with the flanged portions 21, that it prevents the said'portions from spreading apart in the recesses.

I claim:

1. An artificial tooth comprising a body containing a narrow slot having a mouth opening on and wholly interrupting one of its faces, and a closed end spaced from the 68 opposite face, two intermediate faces of the body being partly interrupted by the slot and provided with recesses which are wider than the slot, the closed end of the slot being spaced from the mouth thereof, a distance much greater than the width of the slot, and a metal plate fitting the slot and having a narrow exposed outer end, substantially flush with the face containing the mouth of the slot, an inner end abutting the closed end of U, the slot, and flanged opposite exposed edge nature.

SIMON MYERSON. 

